254 Tripos fusus 梭狀角藻 Phylum: Dinoflagellata 门：甲藻門 Class: Dinophyceae 纲：甲藻綱 Order: Gonyaulacales 目：膝溝藻目 Family: Ceratiaceae 科：角藻科 Morphology Cells are long, narrow, fusiform, and widened in the cingular region. The epicone is conical, gradually tapering into a long apical horn which is slightly curved towards the dorsal part and possess a flat, open end. The hypocone is short and have oblique basal contour. The right posterior horn is small or almost absent while the left posterior horn is long and strongly curved towards the dorsal part, with length equal to or slightly longer than apical horn. 形態 細胞獨立生活。細胞細長，橫溝處較寬。上殼近似錐形，逐漸收縮形成長的頂角， 向背側輕微彎曲，末端平截，開口。下殼短，底邊短而斜。右底角小，幾乎不可見， 左底角長，明顯彎向背部，長度和頂角相當或稍長。 Ecology and distribution Tripos fusus is cosmopolitan species in estuarine, coastal and oceanic waters of cold temperate to tropical regions. It is capable to form blooms but no Neoceratium fusus blooms are recorded in Hong Kong coastal waters. 生態與分佈 梭狀角藻是廣布性物種，從河口、近岸到大洋，從寒溫帶到熱帶均有發現。 該物種可引發紅潮，但香港尚無梭狀新角藻紅潮記錄。
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